EUVD-2025-24991

Comprehensive Technical Analysis of EUVD-2025-24991

1. Vulnerability Assessment and Severity Evaluation

The vulnerability in the Bit Form builder plugin for WordPress, identified as EUVD-2025-24991 (CVE-2025-6679), is classified as an arbitrary file upload vulnerability. This flaw arises due to the lack of file type validation in versions up to and including 2.20.4. The severity of this vulnerability is rated at a base score of 9.8 according to CVSS 3.1, indicating a critical risk. The CVSS vector CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H highlights the following:

• Attack Vector (AV): Network (N) - The vulnerability is exploitable over the network.
• Attack Complexity (AC): Low (L) - The attack requires minimal skill or resources.
• Privileges Required (PR): None (N) - No authentication is required to exploit the vulnerability.
• User Interaction (UI): None (N) - No user interaction is required.
• Scope (S): Unchanged (U) - The vulnerability does not change the security scope.
• Confidentiality (C): High (H) - Complete loss of confidentiality.
• Integrity (I): High (H) - Complete loss of integrity.
• Availability (A): High (H) - Complete loss of availability.

2. Potential Attack Vectors and Exploitation Methods

The primary attack vector involves unauthenticated attackers exploiting the arbitrary file upload vulnerability. The attacker can upload malicious files to the server, potentially leading to remote code execution (RCE). The specific conditions for exploitation include:

• PRO Version Activation: The PRO version of the Bit Form plugin must be installed and activated.
• Published Form: A form with an advanced file upload element must be published on the site.

Potential exploitation methods include:

• Uploading Malicious Scripts: Attackers can upload PHP scripts or other executable files that can be executed on the server.
• Web Shells: Uploading web shells to gain persistent access to the server.
• Data Exfiltration: Uploading scripts to exfiltrate sensitive data from the server.

3. Affected Systems and Software Versions

The vulnerability affects all versions of the Bit Form builder plugin up to and including 2.20.4. Specifically, the PRO version of the plugin is required for the vulnerability to be exploitable. The affected product is:

• Bit Form – Custom Contact Form, Multi Step, Conversational, Payment & Quiz Form builder
• Versions: All versions up to and including 2.20.4

4. Recommended Mitigation Strategies

To mitigate the risk associated with this vulnerability, the following strategies are recommended:

• Update the Plugin: Immediately update the Bit Form builder plugin to a version higher than 2.20.4.
• Disable Unnecessary Features: If the PRO version is not required, consider disabling or uninstalling it.
• Implement File Upload Validation: Ensure that file uploads are validated and restricted to safe file types.
• Regular Security Audits: Conduct regular security audits and vulnerability assessments of all plugins and themes.
• Web Application Firewalls (WAF): Deploy WAFs to monitor and block suspicious file upload attempts.
• Monitoring and Logging: Implement robust monitoring and logging to detect and respond to any suspicious activities.

5. Impact on European Cybersecurity Landscape

The vulnerability poses a significant risk to the European cybersecurity landscape, particularly for organizations and individuals using WordPress with the affected plugin. The potential for remote code execution can lead to data breaches, unauthorized access, and service disruptions. Given the widespread use of WordPress, this vulnerability could impact a broad range of sectors, including e-commerce, media, and government websites.

6. Technical Details for Security Professionals

For security professionals, the following technical details are pertinent:

• Detection: Implement intrusion detection systems (IDS) to monitor for unusual file upload activities.
• Incident Response: Develop an incident response plan that includes steps for identifying, containing, and remediating the vulnerability.
• Patch Management: Ensure that a robust patch management process is in place to quickly apply updates to plugins and themes.
• Code Review: Conduct a thorough code review of the Bit Form builder plugin to identify and fix similar vulnerabilities.
• Security Training: Provide training to developers and administrators on secure coding practices and the importance of file type validation.

Conclusion

The arbitrary file upload vulnerability in the Bit Form builder plugin for WordPress is a critical risk that requires immediate attention. By understanding the attack vectors, affected systems, and mitigation strategies, cybersecurity professionals can effectively protect against this vulnerability and safeguard their digital assets.

References

• Wordfence Threat Intelligence
• WordPress Plugin Repository
• WordPress Plugin Changeset